hugo/docs/content/en/functions/duration.md

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duration	Returns a `time.Duration` structure, using the given time unit and duration number.	functions	docs parent functions	time duration	duration TIME_UNIT DURATION_NUMBER

time.Duration converts a given number into a time.Duration structure so you can access its fields. E.g. you can perform time operations on the returned time.Duration value:

{{ printf "There are %.0f seconds in one day." (duration "hour" 24).Seconds }}
<!-- Output: There are 86400 seconds in one day. -->

Make your code simpler to understand by using a chained pipeline:

{{ mul 7.75 60 | duration "minute" }} → 7h45m0s
{{ mul 120 60 | mul 1000 | duration "millisecond" }} → 2h0m0s

You have to specify a time unit for the number given to the function. Valid time units are:

Duration	Valid time units
hours	hour, h
minutes	minute, m
seconds	second, s
milliseconds	millisecond, ms
microseconds	microsecond, us, µs
nanoseconds	nanosecond, ns